Update: OK, I compared the dynamic range of the D5600 versus Canon 6D Mk ii, and at ISO400 its 12 eV (Nikon) versus 11.5 ev (Canon), a small improvement. But I really can't go below ISO400 because even at ISO400 I'd have to increase my exposure times to 4-6 minutes (if I was previously using ISO1600), or 8-12 minutes (if I was previously using Vay Nhanh Fast Money.

canon 6d mark ii best settings